Commitments and Contingencies (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) defendant	Mar. 31, 2024 USD ($) classAction	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Number of class actions | classAction		2
Number of class actions seeking damages | classAction		1
Range of possible loss (up to)		$ 40
Purchase obligation over the next twelve months		4,100
Long-term purchase commitment, term			12 months
Purchase commitment period decrease			$ 2,700
Other receivables		239		$ 137
Cause No. CC-23-03188-E | Pending Litigation
Schedule Of Commitments And Contingencies [Line Items]
Number of defendants | defendant	2
Estimate possible loss (in excess of)	$ 1
Realogy
Schedule Of Commitments And Contingencies [Line Items]
Other receivables		38
Wyndham
Schedule Of Commitments And Contingencies [Line Items]
Other receivables		$ 23
Tax Liability | Real Estate Inc
Schedule Of Commitments And Contingencies [Line Items]
Liability assumed, percent				62.50%
Tax Liability | Wyndham Hotels And Resorts Inc And Travel + Leisure Co.
Schedule Of Commitments And Contingencies [Line Items]
Liability assumed, percent				37.50%